"In short, these flexible devices (easy, fast and simple sorting program changes from the control panel) and agile operation (on-off without waiting time) are ideal to meet the new challenges and needs of the market. In addition, they allow control of the percentage of heavy metals entering the melting process. In this way, they control the final quality of the product and therefore avoid exceeding the permitted limits of these heavy metals, which, if not controlled, could cause "non-conformity" of the casting, with great economic consequences," concludes Brian Gist.
The challenge lies in separating Aluminum and Magnesium
Both in the U.S. and Europe, scrap consumers are increasingly facing the challenge of producing pure aluminum end products that are free of not only heavy metals but also of light fractions, such as magnesium. “Magnesium makes up between 1% and 4% of a typical scrap aluminum fractions and is regarded as an unwanted contaminant in the scrap mix, which in the end makes it difficult for recyclers to sell. Especially in the U.S., secondary aluminum smelters require Zorba to be magnesium free in oder to better sell it within domestic markets”, states Frank van de Winkel, Business Development Manager, Metal.
Van de Winkel moreover adds: “Due to magnesium and aluminum being similar in density, technologies have difficulties in clearly differentiating between these materials in order to separate them. To this end, removing magnesium from aluminum scrap is still a challenge that requires advanced technology.”